WebContentsObserver update for PlzNavigate methods

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 16ae7a2fe3245fb3bc7cebced866bf43d42b180b..6e58e2ce96f54d897712fa0ae2e61492c72e61e5 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -202,9 +202,7 @@ bool NavigationHandleImpl::HasUserGesture() {
 }
 
 ui::PageTransition NavigationHandleImpl::GetPageTransition() {
-  CHECK_NE(INITIAL, state_)
-      << "This accessor should not be called before the request is started.";
-  return transition_;
+  return state_ == INITIAL ? ui::PAGE_TRANSITION_TYPED : transition_;
 }
 
 bool NavigationHandleImpl::IsExternalProtocol() {
@@ -218,13 +216,7 @@ net::Error NavigationHandleImpl::GetNetErrorCode() {
 }
 
 RenderFrameHostImpl* NavigationHandleImpl::GetRenderFrameHost() {
-  // TODO(mkwst): Change this to check against 'READY_TO_COMMIT' once
-  // ReadyToCommitNavigation is available whether or not PlzNavigate is
-  // enabled. https://crbug.com/621856
-  CHECK_GE(state_, WILL_PROCESS_RESPONSE)
-      << "This accessor should only be called after a response has been "
-         "delivered for processing.";
-  return render_frame_host_;
+  return state_ >= READY_TO_COMMIT ? render_frame_host_ : nullptr;
 }
 
 bool NavigationHandleImpl::IsSamePage() {